<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            color: red;
        }
        p{
            color: green;
        }
        span{
            color: blue;
            font-size: 40px;
        }
    </style>
</head>
<body>
    <p>这是一个段落</p>
    <h3>这是一个标题</h3>
    <p>学完<span>前端</span>，继续学JAVA</p>
</body>
</html>